Spontaneous formation and optical manipulation of extended polariton condensates. E. Wertz, L. Ferrier, D. D. Solnyshkov, R. Johne, D. Sanvitto, A. Lemaître, I. Sagnes, R. Grousson, A. V. Kavokin, P. Senellart and G. Malpuech an J. Bloch in Nature Phys. 6:860 (2010).